Method of forming band brakes



March 1, 1927.

1,019,343 M. STRINGER METHOD OF FORMING BAND BRAKES Original Filed Aug. 28, 1924" will) T 1 g. I

-" v v awuwtoz Patented Mar. 1, 1927.

warren STATES PATENT orrlee.

M-nLvIns'rRmGEn, or rorrs'rown, PENNSYLVANIA.

METHOD on roniirms Bl lxTD seams.

Original application filed August 28, 1924,Seria1 NoI'ISfitS. Divided and'this application 'fil'edoctober 19, 1925. Serial No. 63,534.

My invention relates to impr vemcnts in sheet metal stanipings, and more particularly has reference to the stamping of angle split rings such as are especially adapted i'or use in band brakes for vel'iicles such a. automobiles.

It has been customary heretofore to make these angle rings of cast iron which is not entirely satisfactory, and in the few instances where they have been stamped, sheet steel di cs are first punched, and out of each of said discs is -thereafter punched another smaller disc, leaving a flat ring which may then be re-stamped to provide a flange of angle form in cross-section. This method of procedure, however, is not only Very wasteful. of material, but also of labor, and also results in the construction of an angle band or split ring which is not sufficiently uniform.

In the accompanying drawings. I have illustrated in Fig. 1 in longitudinal section, an application of a split ring in position in a suitable form of die, showing the manner of making the first turn of the flange thereof. Fig. 2 indicates a cross-sectional view of the product so formed. Fig. 3

shows a strip of unformed metal in plan view. Fig. 4 is a front view of the dies in position making the second operation. Fig. 5 is a cross-sectional View of the ring after the second operation.

According to the preferred embodiment of my invention, when a split angle band of the character described is to be made, a long narrow strip of material which is first rolled to the proper diameter is thereafter stamped in two operations, the first of which artly turns the flange, and the second of which completely turns the flange, forming an angle split ring in more uniform manner, much more quickly, and with practically no waste of material, also producing a product which is practically clearof all irregularities, and of great uniform strength.

In my co-pending patent application, #734,698, filed August 28, 1924, I have illustrated a suitable form of mechanism adapted to perform the several operations above referred to, this application being in the nature of a division thereof, and being intended to cover more particularly the method described, as distinguished from the mechanism adapted for use in the practice of said method.

preferably at Said mechanism is also illustrated herein and .will be understood from the following:

11 indicates the base block of the die which is provided with a ring 12 normally projected upwardly by any suitable means such as the sprin 13 around the bolts 14:

which are preferably secured in the base block 11 in any convenient manner as shown. The top of the base block is circular in cross-section and is provided with an annular seating for the split ring or hoop of steel. such as 15.

tinues upwardly with a bevel or angle 17 about forty-two degrees. lVhen the split ring 15 is placed in position upon the block 11 as shownin full outline and the upper part 16 of the die is brought down upon the same, the upper portion of the ring is bent inwardly as indicated at 18, producing a slight curvature, as shown to better advantage in Fig. 2. After the bands have been thus shaped. the upper part of the die, is changed, and the upper part-19, shown to advantage in Fig. 4, is substituted. This part of the die it will be observed is provided with a flat portion at rightangles to the vertical wall of the band, and when the same is brought down upon the 16 indicates the upper part of the the which it will be observed conhand as shown in Fig. 4., the flange is formed at right angles as indicated at 21 in F ig. 5. In a band thus formed it will be foiind that the walls are substantially uni-' thereafter completing the bending of said flange with another tool.

2. The method of forming an article of the class described consisting in first forming'a strip of material to the desired diameter, then bending the upper part in a stamping press forming a flange part of the ill) distance said flange is to bebent, and then thereafter completing the bending of said flange with another tool, the first tool having. a beveled engaging Wall and the second tool having a straight engaging wall.

3. The method of forming an article of the class described consisting in first forming a strip of-lnaterial to the desired dialn- 1 eter, then bending the upper part in a stamping press forming a flange part of the 10 distance said flange is to be bent, and then v signature.

, {MELVIN STRINGER. 

